Method and apparatus for installing fasteners



OCL 31, 1944 o. J. HUELSTER METHOD AND APPARATUS FOR INSTALLING FASTENERS 2 Sheets-Sheet l Filed June l2, 1942 gar n.,

mm, Wm VM@ ATTORNEY 0d, 3l., 1944., Q, HUELSTER 2,361,688

METHODAND APPARATUS FOR INSTALLING FASTENERS Filed June 12, 1942 2 Sheets-Shes?I 2 INVENTOR 0770 Ha/575 BYJ/m, @no 041m@ ATTORNEY Patented Oct. 31, 1944 METHOD AND APPARATUS FOR IN STALLIN G FAS'TENERS Otto J. Huelster, Waterbury, Conn., assignor to Scovll Manufacturing Company, Waterbury, Conn., a corporation of Connecticut Application June 12, 1942, Serial No. 446,838

17 Claims.

This invention relates to snap-fastener installations, and is more particularly concerned with a method of and tools for forming snap-fastener members of the type disclosed in a copending application of the same inventor, filed March 30, 1942, Serial No. 436,728, now Patent Number 2,328,016, granted Aug. 31, 1943.

The principal object of the invention is to provide a method of completing the formation of the component members of a snap-fastener installation by applying to them means which will allow the socket member to be separated from its cooperating stud only in response to a pull applied to the fastened members at one particular place on their peripheries, which method is adapted to be carried out either during the course of attach-v ing the members to their supporting sheets, or after they have been secured in place, whereby to avoid any need for orienting the members preliminary to their attachment and yet produce a completed installation in which the one-way limiting means lie in a predetermined and delinite relation to the sheets.

A 'more 'specic object of the invention is to provide a method of forming a lip in the mouth of an otherwise completed snap-'fastener socket member, which lip is of such a nature as to A permit the socket to be separated from a cooperating stud yonly in' response to a pull applied immediately over and under it; and tools which are adapted to rivet or otherwise Secure the socket to a supporting sheet while simultaneously forming a one-way limiting lip on the socket at a denit-epoint'with respect to the sheet in accordance with the method.

It is another specific object of the invention to provide a method of deorming the head portion of fa snap-fastener stud member from its conventional, truly circular conformation in such a way as to facilitate separation of the studfrom a one-way limiting socket; and tools for carrying out this method while simultaneously attaching the stud vto its supporting sheet whereby the deformed portion of the stud may bear a desired relation to its supporting sheet in the completed installation.

'The foregoing and other objects of the invention, 'as well as various features thereof, will be more fully understood from a consideration of the following description and accompanying drawings,- in whichrgure- 1 is a plan View of a partly completed so'oket of 'the kind with which the invention deals;

Figi. 2 is a 'sectional View of the' partly completed socket of Fig. 1 and of an attaching rivet, disposed on opposite sides of a supporting sheet and in cooperative relation with a pair of tools constructed in accordance with the invention, this view illustrating the positions of the several parts at the start of the forming and attaching method;

Fig. 3 is a sectional View, similar to Fig. 2, illustrating the positions of the fastener parts and setting tools at an intermediate stage of the method of the invention;

Fig. 4is a sectional View illustrating the iinal stage of the method, this `view being taken on the line 4-4 of Fig. 3 in order to illustrate certain details of the tools which cannot be seen in that figure;

Fig. 5 is a plan view of a conventional snapfastener stud member which is to be completed in accordance with the invention;

Fig. 6 is a sectional view of the stud member of Fig. 5 and an attaching rivet therefor, the parts being disposed on opposite sides of a supporting sheet and in cooperative relation with a pair of forming and setting tools constructed in accord` ance with the invention, and adapted to carry out the method;

Fig. '7 is a plan view of a portion of the upper one of the setting tools of Fig. 6;

Fig. 8 is a sectional View, similar to Fig. 6, illustrating the bringing together Aof the tools to secure the stud member to its supporting sheet, while simultaneously completing the formation of the stud pursuant to the method of the invention, the section of this Vfigure being taken on the line 8-8 of Fig. 6; and

Fig. 9is an elevational view of the conventional stud member of Fig. 5, with certain parts broken away better to show underlying ones.

In the drawings, and referring to Figs. 1 and 2, numeral l0 identifies generally a partly completed snap-fastener socket member of which the body is a shell which has been stamped and drawn from a sheet-metal blank to provide it with a crown portion Il having a central opening l2 for receiving the end of a tubular attaching rivet, a back flange I 5 extending more or less abruptly outward from the margin of the crown, and a peripheral wall I 6 extending forwardly and inwardly from the back flange, these various elements forming' collectively a recess l'l of tapering proportions, having its largest diameter adjacent the back flange and its smallest diameter at the mouth I8. The spring element of the assembly is preferably `a simple split spring ring 20, which is Vof such size that it may be expanded, when forced against the back flange by a cooperating Snap-fastener stud member, to permit y cation.

and below the lip, the fastened socket and stud move to such relative positions that the axially tiltable portion of the ring 28 then lies in the l enlarged rear end of the stud-receiving recess I1 adjacent the back flange I5 where there is plenty of room for it to expand to release the head of the stud. A pull upon the fastened members at any other point, however, will draw thetapered wall I6 against the axially tiltable portion of the ring to conne that element and prevent its eX- pansion, thereby preventing `the release of the socket from the stud. A fuller understanding of the constructional details of the socket member and the manner in which it operates, may be had by reference to the above-identified pending appli- It will be evident that the completed socket must be installed with its one-way limiting lip 2I lying in a desired and predetermined relation to a supporting sheet so that the point of application of the separating pullV to that sheet will always be determinate. In accordance with the method of the invention this is accomplished by rst aixing the partly completed member to a supporting sheet, and by then upsetting its mouth I8 to form the required one-way limiting lip. Since the partly completed socket is of substantially circular cross section, it has no positional qualitiesl and may be placed at a desired point upon the-sheet Without any other preliminary orientation; and the lip 2| may then be formed at a desired point to produce a iinished socket in which the one-way limiting means bears a proper relation to the sheet. It is preferred that this method be carried out as a part of the operation wherein the socket is installed upon its supporting sheet, in which case it comprises the steps of placing an incomplete member and an attaching rivet on opposite sides of the sheet in back-to- .back relation; `of then forcing they member and rivet together whereby to lock a part of one with a part of the other, with the sheet material rmly engaged between their opposing surfaces; and of simultaneously bending the mouth I8 of the shell of the socket inwardly -to form the lipr 2I at what may be called an oriented position with respect to the sheet.

The method may be better understood by considering the carrying out of its essential steps in a fastener-attaching machine equipped with tools constructed in accordance with the invention as illustrated in Figs. 2 to 4, inclusive. The details i of the machine, as distinguished from the tools,

form no part of theinvention, and have not been illustrated. In order to simplify the description 1t will be assumed that the machine is of the type in which its plunger 22 reciprocates the setting tool 23 towards and away from the relatively stat1onary anvil tool24; and that the machine is not complicated by thewprovision of automatic feed mechanism. At the start of the operation, therefore, when the tools are most widely separated, a partly completed socket member I0 is placed l()k this: When a pull is applied immediately above by hand over the end of the central part 25 of 75 the setting tool 23, and is pressed upwardly until the mouth I8 of its shell is brought to rest against the flange 21 of the sleeve 28, which is slidably mounted uponthe central part and is urged downwardly to its normal position by a spring 29. It will be noted that the relative dimensions of the sleeve and central part are such that, in applying the member as just described, its back flange I5 will engage spring ring 20 and expand that element over the slightly larger lower end of part 25. Accordingly, when the shell of the socket is released, it drops to the position shown in Fig. 2, where it is vheld by the resilient engagement of the ring with the tool. In this position, however, thelower end 38 of the sleeve still lies partially within the shell whereby to hold that element kin a centered position during subsequent operations. As a further preliminary, an attaching rivet 3| is placed upon the shaped face of the anvil 24 with its cap portion 32 firmly supported and with its central tubular barrel 33 alignedwith the opening I2 in the 'shell of the socket. The socket and rivet having been arranged in back-to-back relation, that part of the supporting sheet 34 on which the installation is to be made is interposed between the crown of the shell and the end of the tubular portion of the rivet.

Upon the completion of these preliminaries the machine may be started to cause its plunger 22 to descend, carrying with it the associated setting tool 23. In the first portion of this movement the setting tool places the socket upon the supporting sheet, and the flange 21 of sleeve 28 then engages the mouth of the shell to press that element firmly against the flexible supporting material, while the lower end of the sleeve guides the shell and holds it in a centered position, as

illustrated in Fig. 3. Further downward movement forces the socket and rivet together, causing the end of the barrel 33 of the latter part to pierce the sheet and to enter the socket through the opening I2 in its crown. As the tool approaches the lowermost extremity of its movement, its sleeve 28 is brought to rest against the reaction of supporting spring 29 whereby to hold the socket firmly in its established position. The central part 25, however, continues to move, so that its setting surface 35 may engage the end of the rivet and turn that part outwardly, while its surrounding surface 35 presses the crown of the socket rmly against the sheet. The socket is thus securely attached to the sheet material, with the tines 31 on its back flange and the similar tines 38 on the rivet digging into the material deeply enough to prevent rotary movement of either part with respect to the sheet in subsequent use of the fastener. Simultaneously with the setting action, a notching pin 39, which is carried by the central part 25 with one of its ends projecting laterally through a slot 48 in the surrounding sleeve at a Xed distance above the setting surface 35, engages the mouth I8 of the shell and bends the adjacent part of the tapered wall I6 inwardly to form the one-way limiting lip 2|. In this operation, of course, the major part of the mouth of the shell is supported by the flange l 21 and the end portion 38 of the sleeve 28, so that the bending action may be a clean and satisfactory one. It will also be apparent that the notching pin 39 serves a further function in limiting downward movement of the sleeve 28 upon the central part in responseto the urging of its spring 29e-it denes the normal elevated position of the sleeve with respect to the central part.

Since` the notching pin is located in a fixed agences angular -relation `to the central part of :the tool, and since that tocl itself is held against rotative movement in the plunger, as, 4for example, by a set-screw M, it 4is apparentV that `the 'lip 2f] will always be formed upon the shell `of the :socket at a'predetermined point. Accordingly, if the sheet material A3ft is interposed between the tools'at `the start of the operation, in .a desired. position with respect tothe notchi'ng pin, the lip 2l must appear in the completed and installed `member lin an oriented relation to the sheet.

The final stage 'of the :attaching and lip-forming method is illustrated in Fig. 4. Thereafter the plunger 22 and the yupper setting tool 2.3 may be retracted in the `normal operation of the machine to the positions shown in Fig. 2, at which time the sheet 34 may be 'withdrawn with 'the now completed one-way ydetachable .socket member secured `to its surface.

The socket which has been described above maybe used in conjunction with a stud member 42 of conventional 4design (Fig. `9?) comprising, yfor example, .a hase ange 43 having a .central post with 'a contracted neck 44 adjacent its truly circular head 45 (as shown in full 'lines in Fig. 5), and a central opening d6 for receiving the end of an attaching rivet by `which the member is secured to .a .supporting sheet. If an easier separation of the fastened members is desired, that to say, a lsofte-r yacting 'snap fastener is wanted, it can read-ily be .gotten :by using a stud .of special character having `its hea-d `14.5,ilafttened or relieved to avery slight extent, as indicated at .6i :in dotted lines :in Fig. f5, at each side of that .one of its sectors which will underlie the ,flip 2i of the socket when the members are fastened together in ltheir normal positions. In ,accordance with the invention this special form oi stud .may be made from one of conventional design by bending a portion `of its head outwardly in such a way :as to draw the adacent portions of that head inwardly to form .the relieved :sectors 4i. Here, again, y,the :method is adapted to be practiced as a part of the operation wherein Athe stud member .is secured to .a supporting sheet. Briefly stated, this combined method comprises the steps fof disposing a stud of lconventional design (which ,may `be L called a partly :completed menibern and an :attaching rivet `A4.8 in back-to-'back relation on opposite sides of a supporting `sheet 49, of then forcing the member `and rivet together whereby to interlock a part of one with .a part of the other, with the sheet ymaterial :clamped between thern, .and of y:simultaneously supporting laterally all portions of the head except those which are to :constitute the :relieved sectors, while bending outwardly substantially :the mid-section of the unsupported portion of the hea-d. Accordinglgy, when the mid-portion 50 is pushed laterally outward, the immediately adjacent and'unsupported portions will .be drawn inwardly to form the relieved sectors 4?! in question.

'The method, as y'applied to the :completion -of a stud member, may be more lfully understood by considering .its practice in a fastener-.setting machine which `is equipped with -tools 4constructed in accordance with the invention .as illustrated in Figs.. 6, 7 and f8. Here, again, the details of the machine and its auxiliary equipment, vas distinguished from the too-ls, form `no :part of the invention, and have not been illustrated. .For ease of description .it will be assumed .that fthe machine is of Vsuch v.character as to reciprocate the setting -tool 5.4 towards and a-.way from the anvil tool 52; and that the fastener parts are iedlto it by hand rather ,than by .automatic equipment. At :the inception oi the method, therefore, when die tools are most widely separated, a partly completed stud member 4,2 is inserted .into the open end olf sleeve 523 which surrounds the centralpart 54 :of :the setting tool, Land is :forced upwardly until its head .4:5 expands the spring ring 55 carried by v.the sleeve, .and allows that ring vto enter the contracted .neck 44 of the member. thus :serves to :hold lthe .member within the sleeve as shown Fig. I6. At thistime, also, an attaching rivet 48 Iis placed ,upon the anvil portion 56 of .the lower tool within the recess -dened bythe sleeve 4element 51. When the members have been thusdisposed in back-to-back relation, that part of the supporting sheet upon which the installation is .to be made is inserted between the aligned Opening l4.5 in the ,stud ,and .the end .of the .barrel 58 .of `the rivet.

'Upon the completion of `these Preliminaries the machine may be started .to cause the upper tool 5l to descend towards the anvil tool 52. In this operation vthe sleeve 53 serves .first to place the stud upon the top surface of lthe supponting sheet., and .then to press that sheet Ibetween the under surface of the central part of the stud and .the open end of the barrel 5 8 .of the rivet. Continued downward movement will, of course.. cause the end .of the rivet to pierce the sheet and to enter .the opening 46 in the stud.` Thereafter .the head `lill of sleeve x5l ,engages the underside of the sheet against .the underside of the flange 4,3 of .the stud; .and the sleeve begins to recede against .the reaction .of its supporting spring .6l .to expose more of .the barrel of the rivet y.and allow Ethat part to penetrate farther into .the stud. As `the upper tool `approaches the lowermost extremity of its movement, the lower sleeve will 'be 4brought .to rest by .the .engagement of .the -ends of its slots 62 with the ends .of the crosspin .63. This necessarily places .a limit upon further movement .of the upper sleeve 53, and causes the shaped end of the upper tool to enter the open well of the stud, thereby bringin g its setting surface 54 against the end .of the barrel .of the .rivet to 'turn that element outwardiy and clinch the stud to the sheet. Simultaneously with this action the tapered buttressing surface 5'5 of the tool will be brought into engagement with the complementally tapered surface of the Well portion of the ,stud to buttress the major portion of'it; and the bending surface 65 of the tool, which is tapered more abruptly than the buttressing surface 65, will be brought into kprogressive engagement with the section 50 of the `head of the stud. In between these two surfaces 65, 6B, the tool 'is recessed asindicated at r(il, thus leaving the 'immediately overlying portions of the stud head unbuttressed. According'ly, as the tool approaches the lowermost extremity of its movement, the more abruptly tape-red surface '55 forces the turned-over rim of the mid-section 5510i the studhead out otits trully round contour; `and in this action the `adjacent unbut'tressed sectors of vthe head, which lie :over `the recessed :portions 61 of the tool, will be drawn inwardly to form the relieved `sectors- 41, as shown in `dotted lines in Fig. `5. operation is then complete, :and the tools may be retracted to ltheir initial positions, as shown in Fig. 16; after which the sheet 49 may rbe withdrawn with the stud .securely attached :to lits surface and completed by the 'deformation `of its' head to the shape shownin dotted lines in Fig; 5;

The spring The if desired, the socket IU may be secured to a sheet 34 in any conventional way, and a portion of its wall I6 may then be upset by a tool having a notching pin, such as 39, tofprovide it with a one-way limiting lip 2l located in an' appropriate position with respect to the sheet. It is likewise entirely practicable to secure the stud member to its supporting sheetI 49 in any conventional fashion, and then to deform its head by subjecting it to the action of a tool having a surface which will buttress laterally a large part of the head, another surface which is adapted .to bend outwardly the part of the head of the stud which it engages, and relieved portions at each side of the bending surface which allow the parts of the stud head overlying them to be drawn inwardly in the manner already described. l

It will be observed that in each of the described instances the method is practiced upon a snap-fastener member having a wall portion which is of substantially circular cross section; that the member is completed by buttressing laterally a major portion of that wall while bending the unbuttressed portion thereof; and that the bending is directed inwardly. Thus, in completing the socket member IU of Fig. 1, its initially circular wall I6 is supported laterally along the major portion of its mouth I8, leaving unbuttressed only a small sector which lies in a desired relation to the sheet, and that sector is then bent inwardly and rearwardly of the member to form the one-way limiting lip 2|. Similarly, in completing the stud member 42 of Figs. 5 and 9, the major portion of the wall or walls which denne its initially circular head is buttressed laterally, leaving unbuttressed those sectors 41 which lie in a desired relation to the sheet; and the mid-section 50 of the unbuttressed part is then forced outwardly` whereby to draw inwardly the adjacent sectors 41.

The method has been described in connection with its practice upon a single form of socket, and one type of stud, by specic forms of tools incorporated as parts of a standard setting machine in which the upper tool is reciprocated towards and away from the lower one. It will be apparent to those familiar with the art, however, that various forms of one-way limiting fastener members embodying the inventions of the identifedpending application may be completed by the method of the present invention, that other tools embodyingl the features of the invention may be devised by the mechanic skilled in the art to meet the needs of particular cases,

and that these tools may be incorporated in anyr appropriate type of setting machine, or that the tools may be actuated by hand if that is desired. Accordingly, since the invention is capable of practice in various ways upon fastener members of different designs, and since the illustrated tools are capable of modification without departing from the invention, it is intended that the foregoing shall be construed in a descriptive rather than in a limiting sense.

What I claim is:

l. The method of completing the formation of a one-way detachable snap fastener member which is adapted to be secured to a supporting sheet and has an annular wall, a part of which is deformed out of annular contour thereof, said method comprising the steps of securing a snap fastener member having an annular wall upon a supporting sheet, and of then deforming that portion yof its annular wall which lies in a desired relation to the sheet in such a way as to complete the member and render the fastener restrictive in its detachable relation with a complementary fastener member.

2. The method of completing the formation of a one-way detachable snap fastener member which is adapted to be secured to a supporting sheet and has an annular wall prior to completion of the member, said method comprising the steps of substantially simultaneously securing said member at a desired place upon a supporting sheet and of deforming its annular wall inwardly at a predetermined point with respect to the sheet to facilitate its separation from an engaged cooperating fastening member only in response to a pull applied immediately above and below said deformed portion of the wall.

3. The method of completing the formation of a one-way detachable snap fastener member from a fastener member of the type having an annular wall, which method is adapted to be carried out as a part of the course of attaching such a member to a supporting sheet by means of an attaching rivet which is adapted to pass through the sheet and to enter and be engaged with a cooperating portion of the member; said method comprising the steps of disposing such a snap fastener member having an annular wall and an attaching rivet in back to back relation on opposite sides of a supporting sheet, of then forcing said member and rivet together to interlock a part of one with a part of the other with the supporting sheet clamped between them, and of substantially simultaneously deforming a portion of the annular wall of said member which lies in a predetermined relation to the sheet whereby to complete the formation of the member and render the fastener restrictive in its detachable relation with a complementary fastener member.

- 4. The method of completing the formation of a one-way snap fastener socket member from a socket member of the type having an annular wall which tapers forwardly and inwardly of the member to define a stud-receiving recess, and a split-ring spring element which is of such normal diameter as to be capable of lateral expansion when located in the rear of said recess and to be engaged by said wall to prevent such expansion when confined forwardly in the recess, said method comprising the steps of securing a socket member of the type set forth to a supporting sheet at a desired point and of bending inwardly a limited portion of said annular tapering wall which lies opposite a desired portion of the sheet to form means on said wall which will serve to pivotally confine a portion of the spring ring of the member within the enlarged rear end of its stud-receiving recess.

5. The method of completing the formation of a one-way detachable snap-fastener socket member from a socket member of the type comprising a sheet-metal shell having anI annular wall which tapers forwardly and inwardly to define a recess having a mouth through which a cooperating stud member may be entered, and a split -spring ring in said recess, which ring is of such normal diameter that it may expand when located in the enlarged rear end of the recess but will be held against expansion by engagement :with said tapered wall when connedforwardly in the recess; said method being carried out in the course of attaching la socket member of the type set forth to a supporting sheet by means of a rivet which is adapted to pass through the sheet and to enter and be engaged with a part of the shell of the socket member, and comprising the steps of: disposing such a member and such a rivet on opposite sides of a supporting sheet in back-tosback relation, forcing the member and rivet together to cause a part of one to interlock with a part of the other with the supporting sheet clamped between them, buttressing annularly the major portion of the open mouth of the shell to prevent its sidewise movement while leaving unbuttressed that portion which lies in a desired positional relation to the supporting sheet, and of simultaneously bending rearwardly and inwardly the unbuttressed portion of the mouth whereby to form a lip onthe tapered wall which will pivotally hold a part of the spring ring within the enlarged rear end of the stud-receiving recess of the shell.

6. The method of completing the formation of a one-way detachable snap-fastener stud member .from a stud member of the type comprising a `sheet-metal post having a contracted neck, and an enlarged head which is of substantially circular cross section prior to completion of the member, said method comprising the steps of buttressing laterally the major portion of the inside of the head of such a stud member While leaving its remaining portions unbuttressed, and of simultaneously deforming laterally outward substantially the mid-section of the unbuttressed portions whereby to draw inwardly the adjacent unbuttressed sectors of the head.k

'7. The method of completing the formation of a one-way detachable snap-fastener stud Vmember from a stud member of the type comprising a sheet-metal post having a contracted neck, and an enlarged head which is of substantially circular cross section prior to completion of the member, said method comprising the steps of securing such a member to a supporting sheet at a desired place thereon, of then buttressing laterally the major portion of the inside of the head while leaving the remaining portions 4unbuttressed, and of simultanaeously deforming laterally outward substantially the mid-section of said unbuttressed portions whereby to bend inwardly the adjacent unbuttressed sectors.

8. The method of completing the formation of a one-way detachable snap-fastener stud member from a stud member comprising a sheetmetal post having a contracted neck, and an enlarged head which is of substantially circular cross section prior to the completion of themember, which method is carried out in the course of attaching such a stud to its supporting sheet by means of an attaching rivet which is adapted to pass through the sheet material and be engaged with a part of the stud; said method comprising the steps of: disposing such a member and attaching rivet upon opposite sides of a supporting sheet in back-to-back relation, forcing said member and rivet together whereby to interlock a part of one with a part of the other with vthe sheet, material firmly clamped between them, simultaneously huttressing laterally the major, portion. of the. inside of the head of the stud while leaving the remaining portions unbuttressed, and deforming laterally outward substantially the mid-section of the unbuttressed portions` whereby to draw inwardly the adjacent unbuttressed sectors of the head.

9. vIn amachine for completing the formation of acne-way detachable fastener member from a fastener member of the type having a sheetmetal annular wall while simultaneously securing the'member to a supporting sheet by means of a rivet; an anvil and asetting tool disposed in aligned relation and movable towards and away from each other, said setting tool comprising a central part, a sleeve slidably mounted on said central part, a. spring for. urging said sleeve towards said anvil,` said sleeve being adapted to maintain a fastener element of' the type mentioned in aligned relationwith said central part, said central part having its end surface shaped to engage and clinch within the member the end ofha rivet 'supported on said anvil when said tool and anvil are moved towards each other, and means carried by said central part for engaging and bending out of its annular contour a limited portion of the annular wall of the fastener member to complete its formation during the movement of said anvil and tool.

10. In a machine for completing the formation of a one-way detachable fastener member from a fastener member of the type having a substantially annular sheet-metal wall while simultaneously securing `the member to a supporting sheet by means of a rivet; a relatively stationary anvil, a setting tool aligned with said anvil and movable towards and away therefrom, said tool comprising a central part which is adapted to be positively moved towards said anvil,

a sleeve slidablymounted on and carried by said central part, a spring for urging said sleeve towards said anvil, said sleeve being adapted to maintain@ fastener part of the type mentioned in aligned relation with said central part, said central part having its end surface shaped to engage and clinch within the member the end portion ofv a rivet supported on said anvil when said tool is moved towards said anvil, and means can ried by said central part for engaging and bending out of its annular contour a limited portion of theannular wall of the member whereby to complete its formation during the movement o-f said tool towards said anvil.`

l1. In a machine for simultaneously securing to a supporting sheet and completing the formation of a one-way detachable snap-fastener socket member from a socket member of the type having a substantially annular sheet-metal wall defining a recess with its free edge forming a mouth through which a stud may be entered and a split spring ring confined in such recess: an anvil element and a setting tool disposed in aligned rela.4

tion and movable endwise towards and away from each other, said tool comprising a central part having an outside diameter slightly exceeding that of the inside normal diameter of the split ring of a fastener member of the type mentioned whereby that ring may be resiliently engaged with the central part to hold the member upon ,the tool, a sleeve element slidably mounted on said central part, a spring for urging said sleeve to a normal position at which its end lies behind the end` of the central part; saidsleeve having a flange on its end with a slot therein, which filan'ge'is adapted to Venter the mouth of afas- 'tener member and to buttress substantially all of the circular wall thereof except that portion which overlies the mentioned slot, said central part having an 'end surface which is adapted to engage and clinch within a fastener member disposedthereon the end portion of a rivet supported on said anvil when said tool and anvil are moved towards-each other, and a notching pin carried by said central part at a xed distance.

above its end surface with one of its ends projecting through the slot in said sleeve, said notching pin-being adapted to engage and bend the unbuttressed portion of the annular Wall to complete the formation of the member duringthe movement ofvsaid tool and anvil towards each other. v Y

12.. In a machine according to claim 11, further characterized in that said notching pin is adapted to engage said sleeve and limit move- .ment of that element `under the urging of said spring.

13. In a machine for simultaneously securing to a supporting sheet and completing the formation of a one-way detachable snap-fastener stud -member from a stud member of the type having a substantially annular sheet-metal wall defining a head for the member and an open well in its top, and a contracted neck lying below the head: an anvil element and a setting tool disposed in aligned relation and movable endwise towards and away from each other, said tool comprising a central part, a sleeve slidably mounted on said lcentral part, a spring for urging said sleeve to a normal @position at which its end lies ahead of the end of said central part, said sleeve being adapted to hold a stud memberl of the type mentioned and to maintain it in centered relation to said central part, a spring element in said sleeve for engaging the contracted neck of a stud member entered therein and for resliently holding such member in said sleeve, said central part having its'rend shaped to engage and `clinch within a stud member supported by said sleeve the end of an attaching rivet mounted on said anvil when said anvil and tool are moved towards `each other, and other means on the end of said central part for engaging and bending out of its .annular contour a part of the annular wall of .such a member to complete its formation vduring the movement of said anvil and tool towards each other.

14. In a machine according to claim 13, further characterized in that said sleeve has a slot extending lengthwise thereof, and by the provision of a pin carried by said central part with an end portion projecting into the slot of said sleeve whereby to limit movement of the latter element upon said central ipart under the urging of said spring.

15. In a machine according to claim 13, further characterized in that said means on the end of the central part for engaging and bending a part of the annular wall of a stud member comprises a projecting portion which is adapted to enter the well of a stud member of the kind mentioned supported in said sleeve when said anvil and tool are moved towards each other, said projecting portion having a surface which is adapted to engage and buttress laterally the major portion oi the annular wall of the member, and another surface which is adapted to engage and bend v another portion of the annular wall to complete the formation of the member.

16. In a` machine according to claim'13, further characterized in that said means on the end of the central part for engaging and bending a part of the annular wall of a stud member comprises a projecting portion which is adapted to enter the well of a stud member of the kind mentioned supported in saidsleeve when said anvil and tool are moved towards each other, said projecting portion having a surface which is adapted to engagea-nd buttress laterally the major portion of Ithe annular wall of the member, a pair of relieved portions which do not engage nor buttress the wall of the member, and another surface lying between said relieved portions, which surface is adapted to engage and bend outwardly a portion of the wall whereby to draw inwardly the adjacent and unbuttressed portions thereof.

1'7. In a machine according to claim 13, further characterized in that said means on the end of the central part for engaging and bending a part of the annular wall of a stud member comprises a projecting portion which is adapted to enter the well of a stud member of the kind mentioned supported in said sleeve when said anvil and tool are moved towards each other, said projecting portion having a frusto-conical tapered surface which is adapted to engage and buttress laterally a major portion of the annular wall of the member, a pair of relieved surfaces which neither engage nor buttress the annular wall, and a second frustoconica1 surface which is tapered more abruptly than the first-mentioned one, said surface lying between said relieved portions and being adapted to engage and bend outwardlynone portion of the annular Wall of the member whereby to draw inwardly the sectors of the wall which lie over the relieved sectors.

OTTO J. HUELSTER. 

